C#(csharp) how to resize array (shrink) by Array.Copy

 

        /// <summary>
        /// Emails addresses creating.
        /// </summary>
        /// <param name="incom">The incoming array</param>
        /// <returns></returns>
        private EmailAddressType[] EmailAddressCreate(string[] incom) {
            if (incom == null) return null;
            EmailAddressType[] ret = new EmailAddressType[incom.Length];
            EmailAddressType[] rt;
            int i = 0;
            foreach (string s in incom) {
                if (!string.IsNullOrEmpty(s))
                {
                    ret[i] = new EmailAddressType();
                    ret[i].EmailAddress = s;
                    i++;
                }
            }
            // change size of array
            if (i < incom.Length)
            {
                rt = new EmailAddressType[incom.Length];
                Array.Copy(rt, ret, i);
            }else
            {
                 rt=ret;
            }

            return rt;
        }

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